That's actually another train signed Riverside right next to it. The two trains were staged on the "alternate" Reservoir platform.

I've also seen "PLEASANT ST" , "D WABAN", "BLANDFORD ST", and "PARK STREET." Park Street was actually quite common on the inbound B trains on Sundays for a while. Kenmore is easy to spot during Red Sox games, especially on the D. Reservior should be a common sight too, but it seems to be usual practice to sign the train Riverside and then just take the train out of service at Reservior.

theseaandalifesaver wrote:What else could the roll signs could have listed?

If the rollsign is one of the curtains produced in the 1980’s or earlier, it would contain all of the main Green Line destinations. The 1970’s-era signs with the letter code included all of the major outbound destinations for letters A through E, generic inbound destinations without a letter code (such as ‘PARK STREET’ and ‘LECHMERE’) and the combined ‘M MATTAPAN-ASHMONT’ sign. The older MTA-era signs did not have the letter code, of course, but would have featured all of the early 1960’s routes including ‘LENOX STREET’ and ‘BOSTON UNIVERSITY FIELD’.

Most of you are too young to have seen the roll signs on Type 4 streetcars. They were never, EVER properly square in the sign box. Over the years they became twisted and probably tangled in the gears. But, they were much easier to read than the crummy LEDs of today.

Well, considering the Type 4s and their big Hunter rollsigns were in service for four decades, a little wear and tear is expected!

That condition wasn't unique to the Type 4s... anything with a rollsign, especially a large one, could get askew fairly easily. True, I don't remember the Type 4s, but it certainly was a common sight on Boeing LRVs and even Type 7s.